Would it be possible to download songs directly into the device's library?
That would be a major kick-ass feature for me, and I think for many others with a similar setup, as well.
I have a NAS with all my media files, and whenever I wanna put new stuff on the phone or iPod, I have to turn on one of my computers and add the stuff (right now I'm using CopyTrans, cuz I absolutely hate iTunes).
With a feature like this I would be able add songs to my library directly from my phone and even allow guests to connect to my NAS and get whatever they wanted too, very easily.
With this kind of feature I would certanily pay 3 bucks for the app!